ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#0 stuck for 245s! [kworker/u8:1:13] Modules linked in: irq event stamp: 232758 hardirqs last enabled at (232757): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:214 hardirqs last disabled at (232758): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (232756): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (232756): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:650 softirqs last disabled at (232741): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (232741): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (232741): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:313 Code: 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 58 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 2a fe ff ff RSP: 0018:ffffc90000127870 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8880b8540460 RCX: ffffffff81b0da31 RDX: ffff88801cef0000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffed10170a808d R14: 0000000000000001 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124a06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005608a11b6a90 CR3: 000000000e182000 CR4: 0000000000350ef0 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xe21/0x1600 kernel/smp.c:877 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline] smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2923 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:852 [inline] toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:844 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5984 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:srso_alias_safe_ret+0x0/0x7 arch/x86/lib/retpoline.S:210 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <48> 8d 64 24 08 c3 cc e8 f4 ff ff ff 0f 0b cc cc cc cc cc cc cc cc RSP: 0018:ffffc90000a08ce8 EFLAGS: 00000097 RAX: 0000000000000001 RBX: ffff888032c4e2e8 RCX: ffffffff8199137c RDX: fffff520001411a4 RSI: 0000000000000004 RDI: ffffc90000a08d20 RBP: 1ffff920001411a0 R08: 0000000000000001 R09: fffff520001411a4 R10: 0000000000000003 R11: 0000000000000001 R12: ffff888032c4e2f0 R13: ffff888032c4e2f8 R14: ffff888032c4e340 R15: ffffffff896ab9f0 FS: 0000000000000000(0000) GS:ffff888124b06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000600 CR3: 000000000e182000 CR4: 0000000000350ef0 Call Trace: srso_alias_return_thunk+0x5/0xfbef5 arch/x86/lib/retpoline.S:220 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1301 [inline] queued_spin_lock include/asm-generic/qspinlock.h:111 [inline] do_raw_spin_lock+0x12c/0x2b0 kernel/locking/spinlock_debug.c:116 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xd9/0xc80 net/sched/sch_taprio.c:929 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0xf8/0x20a0 arch/x86/kernel/unwind_orc.c:482 Code: d5 2c 00 e8 5a 03 f3 09 5a 85 c0 0f 85 57 09 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8d 65 50 4c 89 e2 48 c1 ea 03 80 3c 02 00 <0f> 85 e8 17 00 00 4d 8b 75 50 4d 85 f6 74 36 49 8d be 88 00 00 00 RSP: 0018:ffffc90003167548 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 000000000b876632 RDX: 1ffff9200062cec1 RSI: ffffffff8bf07940 RDI: ffffffff8dcd2ee8 RBP: ffffc90003167600 R08: 5f77cbb3d8f98d14 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90003167608 R13: ffffc900031675b8 R14: 0000000000000000 R15: ffff888029390000 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 __kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2543 [inline] free_to_pcs_bulk+0x187/0x7b0 mm/slub.c:6337 mt_free_bulk lib/maple_tree.c:179 [inline] mt_destroy_walk+0xa20/0xf60 lib/maple_tree.c:5000 mte_destroy_walk lib/maple_tree.c:5049 [inline] mte_destroy_walk lib/maple_tree.c:5040 [inline] __mt_destroy+0x310/0x3e0 lib/maple_tree.c:6446 exit_mmap+0x614/0xb90 mm/mmap.c:1315 __mmput+0x12a/0x410 kernel/fork.c:1133 mmput+0x62/0x70 kernel/fork.c:1156 exit_mm kernel/exit.c:582 [inline] do_exit+0x7c7/0x2bf0 kernel/exit.c:954 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107 __do_sys_exit_group kernel/exit.c:1118 [inline] __se_sys_exit_group kernel/exit.c:1116 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1116 x64_sys_call+0x150b/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f061358f749 Code: Unable to access opcode bytes at 0x7f061358f71f. RSP: 002b:00007fff86910d28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f061358f749 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000003 R08: 0000000586910e1f R09: 00007f06137b4280 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f06137b4280 R14: 0000000000000003 R15: 00007fff86910de0